Rated 4 out of 5 stars

Hoping in near future this extension can support Chinese language. Actually, my wish is not for me, I just hope my father can enjoy your masterpiece as well.

This review is for a previous version of the add-on (1.1). 

Available in the Next Version

This is actually already present in the next version, I am just waiting for Mozilla to approve it.
I hope your father can make use of my add-on, and if you have any other ideas/suggestions I'll be happy to hear.